JP4645381B2 - Wheeled tire testing apparatus and testing method - Google Patents

Description

  The present invention relates to a test apparatus and a test method for carrying out a dynamic test of a tire with wheels, and more particularly to mounting a tire with wheels without being eccentric with respect to a tire mounting shaft, thereby providing accurate test results. The present invention relates to a test apparatus and a test method for a wheeled tire that makes it possible to obtain the above.

  Conventionally, with respect to pneumatic tires, a dynamic balance test for measuring imbalance during rotation and a uniformity test for measuring variation in force generated during rotation have been performed.

  As a device for carrying out such a dynamic balance test and uniformity test, a wheel mount having a rotating shaft directed in the vertical direction is provided, a tire mounting shaft extending in the rotating shaft direction on the wheel mount, and the tire mounting shaft A collet member that is coaxially arranged around and is inserted into the wheel hub hole and a flange surface that extends radially from the base end of the tire mounting shaft is provided, and as the tire mounting shaft moves away from the flange surface, A test apparatus for a tire with a wheel has been proposed in which a tapered surface with a smaller outer diameter is formed while a tapered surface with a smaller inner diameter is formed on the collet member as the distance from the flange surface increases (see, for example, Patent Document 1). .

  In the test method using the above test apparatus, the wheeled tire is closely attached to the flange surface so that the collet member is inserted into the hub hole, and the collet member is pressed against the flange surface side so that the outer diameter of the collet member is reduced to the hub hole. The wheeled tire in a state of being positioned by the collet member is fixed to the wheel pedestal, and then the wheeled tire is dynamically tested while rotating the wheel pedestal.

With respect to such a test apparatus, it is desired to orient the rotation axis of the wheel mount in the horizontal direction for convenience in handling the tire with wheels. However, when the rotation axis of the wheel mount is oriented in the horizontal direction, there is a problem that the collet member does not expand uniformly due to the influence of the weight of the tire with the wheel, and the tire with the wheel is eccentric with respect to the tire mounting axis. And if a dynamic balance test and a uniformity test are implemented in the state where the tire with wheels is eccentric, the accuracy of the test results will be reduced.
Japanese Patent Laid-Open No. 2003-4597

  An object of the present invention is to provide a test apparatus and a test method for a wheeled tire that allows a wheeled tire to be mounted without being eccentric with respect to a tire mounting shaft, thereby obtaining an accurate test result. is there.

In order to achieve the above object, a test apparatus for a wheeled tire according to the present invention includes a wheel mount having a rotation axis oriented in a horizontal direction, a tire mounting shaft extending in the rotation axis direction on the wheel mount, and a periphery of the tire mounting shaft An expandable / contractible collet member that is coaxially disposed in the hub hole of the wheel and a flange surface that extends radially from the base end portion of the tire mounting shaft are provided, and the tire mounting shaft is separated from the flange surface. In the test apparatus for a tire with a wheel, in which a tapered surface whose outer diameter decreases as the outer diameter decreases, and a tapered surface whose inner diameter decreases as the distance from the flange surface increases in the collet member,
A tire support means for transporting the tire with wheels while supporting the tire so that a central axis faces a horizontal direction, and a load detection means for detecting a load in a vertical direction applied to the tire mounting shaft are provided. To do.

In addition, a test method for a wheeled tire according to the present invention for achieving the above object includes a wheel mount having a rotation shaft oriented in a horizontal direction, a tire mounting shaft extending in the rotation axis direction on the wheel mount, and the tire mounting shaft An expandable / contractible collet member that is coaxially disposed around the wheel and inserted into a hub hole of the wheel and a flange surface that extends radially from a base end portion of the tire mounting shaft are provided, and the flange mounting surface is provided on the tire mounting shaft. In the test method of a wheeled tire using a test apparatus in which a tapered surface whose outer diameter decreases as the distance from the flange decreases, while a tapered surface whose inner diameter decreases as the distance from the flange surface decreases in the collet member,
The wheeled tire is transferred while being supported by tire support means so that the center axis thereof is oriented in the horizontal direction, the wheeled tire is brought into close contact with the flange surface so that the collet member is inserted into the hub hole, A load in the vertical direction applied to the tire mounting shaft is detected by a load detection means, and the position of the wheeled tire is adjusted by the tire support means so that the vertical load on the tire mounting shaft is reduced, and the collet The member is pressed against the flange surface side to increase the outer diameter of the collet member to the inner diameter of the hub hole, and the wheeled tire positioned by the collet member is fixed to the wheel mount, and then the wheel A dynamic test of the wheeled tire is performed while rotating the gantry. It is.

  In the present invention, a tire support means for transferring a wheeled tire while supporting the tire with a wheel so that the central axis thereof is directed in the horizontal direction, and a load for detecting a vertical load applied to the tire mounting shaft. By providing the detection means and using the tire support means and the load detection means, the weight of the tire with wheels prevents the collet member from being uniformly expanded. Therefore, it is possible to mount the tire with a wheel without decentering it with respect to the tire mounting axis, and in turn, the accuracy of the dynamic test of the wheeled tire including the dynamic balance test and the uniformity test can be improved. It becomes possible.

  In the present invention, the outer diameter of the collet member in the contracted state is preferably smaller by 0.01 mm to 0.5 mm than the inner diameter of the hub hole of the wheel. Thereby, it is possible to cope with various hub holes whose inner diameters are within the tolerance range.

  The load detection means may be installed on the wheel mount or on the tire support means. Thereby, the load of the perpendicular direction with respect to a tire attachment axis | shaft can be detected by the load detection means installed in the wheel mount, or the load detection means installed in the tire support means.

  In the present invention, the position of the wheeled tire is adjusted by the tire support means so that the load in the vertical direction with respect to the tire mounting shaft is reduced. At that time, the load in the vertical direction with respect to the tire mounting shaft is preferably 10 N or less. . Therefore, in the tire testing apparatus with wheels, it is preferable to provide a control means for controlling the tire support means based on the detection result of the load detection means. In this case, when adjusting the position of the wheeled tire by the tire support means, the tire support means can be controlled based on the detection result of the load detection means so that the load in the vertical direction with respect to the tire mounting shaft is 10 N or less. .

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a wheel mount of a wheeled tire testing apparatus according to the first embodiment of the present invention, and FIG. 2 shows a tire support means of the wheeled tire testing apparatus. 1 and 2, the wheeled tire 1 is composed of a pneumatic tire 2 and a wheel 3. The wheel 3 includes a disk portion 4 extending from the rim toward the central axis, and a hub hole 5 is formed at the inner edge of the disk portion 4. The disk portion 4 is formed with a plurality of bolt holes 6 for fixing the wheel 3 to the vehicle.

  As shown in FIG. 1, the wheel mount 11 on which the wheeled tire 1 is mounted is installed such that the rotation axis A thereof is oriented in the horizontal direction. The wheel mount 11 includes a tire mounting shaft 12 extending in the rotation axis direction, a collet member 13 that is coaxially disposed around the tire mounting shaft 12 and is inserted into the hub hole 5 of the wheel 3, A flange surface 14 extending in the radial direction from the base end portion of the tire mounting shaft 12 is provided. A bolt member 15 is disposed on the distal end side of the tire mounting shaft 12, and a nut member 16 for pressing the collet member 13 against the bolt member 15 is screwed. In addition, a plurality of bolts 17 project from the flange surface 14 at positions corresponding to the plurality of bolt holes 6 of the wheel 3, and the wheeled tire 1 is disposed at predetermined positions with respect to these bolts 17. Then, the nut 18 is tightened.

  The tire mounting shaft 12 is formed with a tapered surface 12a whose outer diameter decreases as the distance from the flange surface 14 increases. On the other hand, the collet member 13 is formed with a tapered surface 13a whose inner diameter decreases as the distance from the flange surface 14 increases. The inclination of the taper surface 12a and the inclination of the taper surface 13a are substantially the same. Therefore, when the collet member 13 is pressed against the flange surface 14 by tightening the nut member 16, the collet member 13 increases the outer diameter while moving along the tapered surface 12a. The outer diameter of the collet member 13 in the contracted state is set smaller by 0.01 mm to 0.5 mm than the inner diameter of the hub hole 5 of the wheel 3. Although the specific structure of the collet member 13 is not particularly limited, for example, it is possible to use a synthetic resin cylindrical tube in which cuts extending in the axial direction from both ends in the axial direction are alternately provided. it can.

  The wheel mount 11 is provided with a dynamometer 19 (load detection means) such as a wheel dynamo. This dynamometer 19 detects a vertical load applied to the tire mounting shaft 12. The detection result of the dynamometer 19 is supplied to the control circuit 20 (control means). Although this control circuit 20 controls the tire support means described later based on the detection result of the dynamometer 19, it is not always necessary.

  On the other hand, as shown in FIG. 2, a lifter 21 (tire support means) is installed in the vicinity of the wheel mount 11 to support the wheeled tire 1 while supporting the tire with the central axis facing the horizontal direction. The lifter 21 includes a tire holding portion 22 that holds the wheeled tire 1 in a standing state, and a bending / extending portion 23 that moves the tire holding portion 22 in the vertical direction. That is, the lifter 21 adjusts its position while supporting the load of the wheeled tire 1.

  1 and 2, the means for rotationally driving the wheel mount 11 and the means for carrying out the dynamic test on the wheeled tire 1 are omitted, but these means are conventionally known. Can be used.

  Next, a method for testing a wheeled tire using the above-described test apparatus will be described. First, the wheeled tire 1 is transferred while being supported by the lifter 21 so that the central axis thereof is oriented in the horizontal direction, and the wheeled tire 1 is brought into close contact with the flange surface 14 so that the collet member 13 is inserted into the hub hole 5. . Here, the load in the vertical direction applied to the tire mounting shaft 12 is detected by a dynamometer 19 installed on the wheel mount 11, and the lifter 21 adjusts the vertical load on the tire mounting shaft 12 to 0N to 10N. The position of the wheeled tire 1 is adjusted. After the adjustment, the collet member 13 is pressed toward the flange surface 14 to increase the outer diameter of the collet member 13 to the inner diameter of the hub hole 5, and the wheeled tire 1 positioned by the collet member 13 is adjusted in the tire radial direction and The wheel base 11 is fixed so as not to move in the axial direction. Thereafter, a dynamic test of the wheeled tire 1 is performed while rotating the wheel mount 11.

  According to the test method for a wheeled tire described above, when the wheeled tire 1 is positioned by the expansion of the collet member 13, the load of the wheeled tire 1 is supported by the lifter 21, so that the weight of the wheeled tire 1 is reduced. Can be prevented from inhibiting the uniform expansion of the collet member 13. Accordingly, the wheeled tire 1 can be mounted without being decentered with respect to the tire mounting shaft 12, and thus the accuracy of the dynamic test of the wheeled tire including the dynamic balance test and the uniformity test is improved. Can do.

  In addition, when positioning the tire 1 with a wheel, when the force loaded on the tire attachment axis | shaft 12 resulting from the dead weight of the tire 1 with a wheel exceeds 10N, there exists a possibility of producing eccentricity in the tire 1 with a wheel. .

  When the lifter 21 is controlled based on the detection result of the dynamometer 19 using the control circuit 20, for example, the control can be performed by the following method. That is, when the dynamometer 19 detects the downward force applied to the tire mounting shaft 12, the lifter 21 is raised by a preset amount, and the upward force applied to the tire mounting shaft 12 is increased. Is detected, the lifter 21 is lowered by a preset amount. Then, the lifter 21 continues to rise or fall until the force detected by the dynamometer 19 becomes 10 N or less. Thereby, based on the detection result of the dynamometer 19, the lifter 21 can be controlled and the position of the tire 1 with a wheel can be adjusted automatically.

  FIG. 3 shows a wheel base of the wheeled tire testing apparatus according to the second embodiment of the present invention, and FIG. 4 shows a tire support means of the wheeled tire testing apparatus. 3 and 4, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the wheel mount 11 does not include a dynamometer 19. On the other hand, as shown in FIG. 4, a balancer 31 (tire support means) is installed in the vicinity of the wheel mount 11 to support the wheeled tire 1 while supporting the tire with the central axis in the horizontal direction. The balancer 31 includes a tire holder 32 that holds the wheeled tire 1 in a standing state, and a suspension 33 that moves the tire holder 32 while suspending the tire holder 32 in the vertical direction. That is, the balancer 31 adjusts its position while supporting the load of the wheeled tire 1.

  A load meter 34 (load detection means) is installed on the suspension 33 of the balancer 31. This load meter 34 constantly measures the load of the wheeled tire 1 and detects the vertical load applied to the tire mounting shaft 12 based on the change. The detection result of the load cell 34 is supplied to the control circuit 35 (control means). The control circuit 35 controls the balancer 31 based on the detection result of the load cell 34, but is not necessarily required.

  Next, a method for testing a wheeled tire using the above-described test apparatus will be described. First, the wheeled tire 1 is transferred while being supported by the balancer 31 so that the central axis thereof is oriented in the horizontal direction, and the wheeled tire 1 is brought into close contact with the flange surface 14 so that the collet member 13 is inserted into the hub hole 5. . Here, the load in the vertical direction applied to the tire mounting shaft 12 is detected by a load meter 34 installed on the balancer 31, and the balancer 31 rotates the wheel so that the vertical load on the tire mounting shaft 12 becomes 0N to 10N. The position of the attached tire 1 is adjusted. After the adjustment, the collet member 13 is pressed toward the flange surface 14 to increase the outer diameter of the collet member 13 to the inner diameter of the hub hole 5, and the wheeled tire 1 positioned by the collet member 13 is adjusted in the tire radial direction and The wheel base 11 is fixed so as not to move in the axial direction. Thereafter, a dynamic test of the wheeled tire 1 is performed while rotating the wheel mount 11.

  According to the test method for a wheeled tire 1 described above, when the wheeled tire 1 is positioned by the expansion of the collet member 13, the balancer 31 supports the load of the wheeled tire 1; Can be prevented from inhibiting the uniform expansion of the collet member 13. Accordingly, the wheeled tire 1 can be mounted without being decentered with respect to the tire mounting shaft 12, and thus the accuracy of the dynamic test of the wheeled tire including the dynamic balance test and the uniformity test is improved. Can do.

  When the balancer 31 is controlled based on the detection result of the load meter 34 using the control circuit 35, for example, the control can be performed by the following method. That is, when the load meter 34 shows a value smaller than the weight of the wheeled tire 1, the weight loss value from the weight corresponds to the downward force applied to the tire mounting shaft 12. When the downward force applied to the tire mounting shaft 12 is detected based on the above, the balancer 31 is raised by a preset amount. On the other hand, when the load meter 34 shows a value larger than the weight of the wheeled tire 1, the increased value from the weight corresponds to the upward force applied to the tire mounting shaft 12. When the upward force applied to the tire mounting shaft 12 is detected based on the above, the balancer 31 is lowered by a preset amount. Then, the balancer 31 continues to rise or fall until the force detected using the load meter 34 becomes 10 N or less. Thereby, the balancer 31 can be controlled based on the detection result of the load meter 34, and the position of the tire 1 with a wheel can be adjusted automatically.

  For a tire with a wheel in which a pneumatic tire with a tire size of 225 / 55R16 is assembled to a wheel with a rim size of 16 × 7.5JJ, a test speed of 120 km / h is used by using the wheel tire test apparatus shown in FIGS. The primary component of radial force variation (RFV) was measured under the conditions (Example).

  In addition, for the wheeled tire described above, using a wheeled tire testing apparatus equipped with a wheel mount similar to that of the example, the wheeled tire was manually mounted on the wheel mount, and then the test was performed at a test speed of 120 km / h. The primary component of force variation (RFV) was measured (conventional example).

In each of these examples and the conventional example, the measurement was performed five times, and the tire with a wheel was reattached to the wheel mount for each measurement. The measurement results are shown in Table 1.

  As is apparent from Table 1, the standard deviation of the measurement result was smaller in the example than in the conventional example, and the measurement accuracy was high.

It is sectional drawing which shows the principal part of the wheel mount of the testing apparatus of the tire with a wheel which consists of 1st Embodiment of this invention. It is a front view which shows the principal part of the tire support means of the testing apparatus of the tire with a wheel which consists of 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the wheel mount of the testing apparatus of the tire with a wheel which consists of 2nd Embodiment of this invention. It is a front view which shows the principal part of the tire support means of the test apparatus of the tire with a wheel which consists of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire with wheel 2 Pneumatic tire 3 Wheel 4 Disc part 5 Hub hole 11 Wheel mount 12 Tire mounting shaft 12a Tapered surface 13 Collet member 13a Tapered surface 14 Flange surface 19 Dynamometer (load detection means)
20 Control circuit (control means)
21 Lifter (Tire support means)
31 Balancer (Tire support means)
34 Load cell (load detection means)
35 Control circuit (control means)

Claims (11)

A wheel mount having a rotating shaft oriented in the horizontal direction, a tire mounting shaft extending in the rotating shaft direction on the wheel mount, and a coaxial arrangement around the tire mounting shaft and being inserted into a hub hole of the wheel. A collet member and a flange surface extending radially from a base end portion of the tire mounting shaft are provided, and a tapered surface whose outer diameter decreases as the tire mounting shaft moves away from the flange surface is formed. In the test apparatus for wheeled tires formed with a tapered surface whose inner diameter decreases as the distance from the flange surface increases,
A tire with a wheel provided with a tire support means for transferring the wheeled tire while supporting a tire so that a central axis thereof is oriented in a horizontal direction, and a load detection means for detecting a load in a vertical direction applied to the tire mounting shaft. Test equipment.   The wheeled tire testing apparatus according to claim 1, wherein an outer diameter of the collet member in a contracted state is 0.01 mm to 0.5 mm smaller than an inner diameter of a hub hole of the wheel.   The wheeled tire testing apparatus according to claim 1 or 2, wherein the load detecting means is installed on the wheel mount.   The wheeled tire testing apparatus according to claim 1 or 2, wherein the load detection means is installed on the tire support means.   The wheel tire test apparatus according to any one of claims 1 to 4, further comprising a control unit that controls the tire support unit based on a detection result of the load detection unit. A wheel mount having a rotating shaft oriented in the horizontal direction, a tire mounting shaft extending in the rotating shaft direction on the wheel mount, and a coaxial arrangement around the tire mounting shaft and being inserted into a hub hole of the wheel. A collet member and a flange surface extending radially from a base end portion of the tire mounting shaft are provided, and a tapered surface whose outer diameter decreases as the tire mounting shaft moves away from the flange surface is formed. In the test method of a wheeled tire using a test device in which a tapered surface whose inner diameter decreases as the distance from the flange surface increases,
The wheeled tire is transferred while being supported by tire support means so that the center axis thereof is oriented in the horizontal direction, the wheeled tire is brought into close contact with the flange surface so that the collet member is inserted into the hub hole, A load in the vertical direction applied to the tire mounting shaft is detected by a load detection means, and the position of the wheeled tire is adjusted by the tire support means so that the vertical load on the tire mounting shaft is reduced, and the collet The member is pressed against the flange surface side to increase the outer diameter of the collet member to the inner diameter of the hub hole, and the wheeled tire positioned by the collet member is fixed to the wheel mount, and then the wheel A dynamic test of the wheeled tire is carried out while rotating the gantry. Test methods Lumpur with tire.   The test method for a tire with a wheel according to claim 6, wherein an outer diameter of the collet member in a contracted state is smaller by 0.01 mm to 0.5 mm than an inner diameter of a hub hole of the wheel.   The method for testing a tire with a wheel according to claim 6 or 7, wherein a load in a vertical direction with respect to the tire mounting shaft is detected by a load detection means installed on the wheel mount.   The test method for a wheeled tire according to claim 6 or 7, wherein a load in a vertical direction with respect to the tire attachment shaft is detected by a load detection means installed on the tire support means.   The test method for a wheeled tire according to any one of claims 6 to 9, wherein when the position of the tire with a wheel is adjusted by the tire support means, a load in a vertical direction with respect to the tire mounting shaft is 10 N or less. . When adjusting the position of the wheeled tire by the tire support means, the tire support means is controlled based on the detection result of the load detection means so that the load in the vertical direction with respect to the tire mounting shaft is 10 N or less. The test method for a tire with a wheel according to any one of claims 6 to 9.

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